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Our clear-view tubes are a fascinating way for kids to get hands-on experience with friction, flow and speed! Each tube is designed to showcase a different aspect of motion—children simply flip the tubes and watch as the angle of a track determines the speed of the balls, the size of a funnel controls flow…and the smoothness of the track controls how fast or slow the balls move! You get a set of 3 permanently sealed tubes; each measures 13 1/2″.